The Science of Fasting

I've been doing intermittent fasting off and on for about 3 years now. I mainly do two 24 hour fasts a week. It's pretty easy... the trouble I have is trying to eat a normal meal when I break the fast. It's actually easier for me to go 36 hours and have a normal breakfast... but since I usually do a really hard workout in the mornings, it's really hard for me to give maximum effort if I had eaten in 36 hours, so I do the 24 hour fasts instead.

I'm probably going to switch to a 16-8 fast and try that for a while.

I'm intrigued by the idea of doing a 96 hour fast, but I hate not eating when my family is having dinner.